What is The CASS Corrosion Test

The CASS corrosion test, also known as copper salt accelerated acetate spray test, is a rapid salt spray corrosion test recently developed abroad. The test temperature is 50 ° C. A small amount of copper salt-copper chloride is added to the salt solution, which strongly corrodes. Its corrosion rate is about eight times that of the NSS test.

CASS corrosion test related standards: ASTM, ISO, etc.

CASS corrosion test requirements for test equipment:

First, the equipment required for the CASS test includes: a salt spray chamber, a saline solution storage tank, a suitably compressed compressed air supply device, one or more atomizing nozzles, a fragment holder, heating equipment for the salt spray chamber, and necessary controls device. The size and detailed structure of the equipment are arbitrary as long as the conditions obtained can meet the requirements of this method.

Second, the structure of the instrument should be such that the stack accumulated on the top plate or cover of the salt spray box does not fall on the part under test. Substitutions dropped from the test specimen shall not be recovered into the solution storage tank for re-spraying.

Third, the material or structure should not affect the corrosion of the salt spray, and the material or structure itself should not be affected by the corrosion of the salt spray.

LIB SC salt spray test chamber has adjustable humidity and salt spray function, which can be used for CASS corrosion test and related standard test

CASS corrosion test solvent preparation

First, the test solution is prepared by dissolving sodium chloride in distilled water or deionized water to a concentration of 50 g / L. Sodium chloride must be white and soluble in the solution to obtain a colorless solution. In principle, sodium chloride cannot contain copper and nickel, and the amount of sodium iodide should be less than 0.1%, and the total impurities calculated based on the dry salt should not exceed 0.4%. If the pH of the configured solution is outside the range of 6.0 to 7.0, check for harmful impurities in salt or water.

Second, a sufficient amount of copper dichloride (CuCl2H2O) needs to be added to the salt solution to make it a concentration of. 0.26% 0.02g / L (equal to 0.205% 0.05g / L CuCl2H2O).

Third, a sufficient amount of ice vinegar needs to be added to the salt solution to ensure that the pH of the salt fog concentration sample collected in the test box is between 3.1 and 3.3. If the pH value of the initially prepared solution is 3.0 to 3.1, the pH value of the spray solution will most likely fall within this range. All pH values should be measured with an electrical meter at 25C. However, it can read the precise pH test paper with 0.3PH increase and decrease and has been verified by electrical measurement and control, which can be used for daily inspection. Add analytical pure glacial acetic acid or sodium hydroxide to make any necessary adjustments.

Fourth, in order to remove any substance that clogged the nozzle of the spray equipment, the solution must be filtered before being filled into the equipment storage tank.

why choose our products

 

1. Advanced Cyclic Corrosion Testing Chamber

2. Effective SAE J2334 Salt Spray Cabinet

3. ASTM G85 Salt And SO2 Spray Test Chamber

4. SO2 H2S Noxious Gas Corrosion Test Chamber

5. Environmental Chamber Temperature Humidity Control

6. Sand Dust Testing Chamber for dustproof chamber

 

 

》》》For more technical information and details about our SC Salt Spray Test Chamber, please feel free to email us at info@libtestchamber.com. 

 

Procedure for Coating Testing Using LIB SC Salt Spray Test Chamber

Coating testing is essential for evaluating the durability of protective layers on materials, especially when exposed to harsh environmental conditions. LIB SC Salt Spray Test Chamber provides a precise, controlled, and customizable testing environment that ensures reliable results. The chamber simulates a range of corrosive conditions that coatings must withstand, helping you assess performance under accelerated, real-world stress. Below are the steps involved in coating testing with LIB SC Salt Spray Test Chamber, highlighting how the system's advanced features support each phase.

Step 1: Prepare the Test Samples

LIB Advantage: The chamber's large, accessible test area allows for easy sample placement, even for larger parts such as automotive panels or industrial components.

• Clean and dry the coating samples before placing them in the chamber. Any contaminants or moisture on the surface could affect the test results.
• Attach the samples securely in the test chamber. Ensure proper positioning for uniform exposure to the salt fog environment.

Step 2: Choose the Test Solution

LIB Advantage: LIB's precise control over solution concentration ensures that the solution used for testing matches the required standards, such as ISO 9227 or ASTM B117.

• Prepare the appropriate salt solution (typically 5% NaCl) based on the standards you are following. You may use variations like acetic acid salt spray (AASS) or copper-accelerated acetic acid salt spray (CASS) if specified for your testing.
• Fill the solution tank of the LIB SC Salt Spray Test Chamber. The chamber's solution mixing and recirculation system ensures consistent concentration levels, preventing sediment buildup or variation during testing.

Step 3: Set the Test Parameters

LIB Advantage: With the advanced PID touchscreen controller, you can set and monitor temperature, humidity, and spray cycles in real-time. LIB's easy-to-use interface allows you to program multiple phases with a few simple steps.

• Program the chamber to the desired test mode-Neutral Salt Spray (NSS), Acetic Acid Salt Spray (AASS), or Copper-Accelerated Acetic Acid Salt Spray (CASS)-depending on your test requirements.
• Set the temperature, humidity, and salt spray deposition rate. For example, for standard NSS tests, set the chamber to 35°C ± 2°C with a 5% NaCl solution at pH 6.5–7.2, ensuring the fog is atomized at a rate of 1–2 mL/80 cm²/hr.

LIB SC's real-time temperature and humidity monitoring ensures that the test conditions are accurate, providing reproducible results.

Step 4: Start the Test Cycle

LIB Advantage: The chamber's automated, multi-phase system manages the testing process, including salt spray, drying, and humidity cycles. This means you don't have to manually adjust settings between phases, making the testing process more efficient.

• Start the test, allowing the chamber to automatically cycle through the programmed stages. LIB SC supports multiple phases, including salt spray, drying, and high humidity exposure, simulating real-world corrosion conditions.

As the test progresses, LIB SC's dual hanging spray towers ensure uniform salt fog coverage across all test specimens, eliminating dead zones and ensuring all samples receive consistent exposure.

Step 5: Monitor and Adjust the Test

LIB Advantage: The LIB SC Salt Spray Test Chamber provides a high level of precision and real-time feedback. The advanced sensor suite (PT-100 Class A) guarantees accurate temperature and humidity readings, helping to monitor the test conditions without interruptions.

• Continuously monitor the test via the PID color touchscreen, which displays temperature, humidity, and spray status in real-time.
• Adjust settings if necessary using the intuitive control panel, ensuring that the test remains in compliance with the required standards.

Step 6: Evaluate the Test Results

LIB Advantage: After the test completes, the chamber allows for easy removal of test samples. The automated data logging feature ensures that all test parameters are recorded, providing a full audit trail for compliance purposes.

• Remove the test samples carefully, ensuring that the results are not influenced by any additional handling or environmental factors.
• Inspect the coatings for signs of corrosion, peeling, cracking, or discoloration. Compare the results with the expected performance criteria outlined in the relevant standards.

Step 7: Maintain the Equipment

LIB Advantage: LIB SC Salt Spray Test Chamber is designed with ease of maintenance in mind. The external saltwater tank and filtration system simplify the cleaning process, while the self-diagnostic features ensure that the equipment is always running at peak efficiency.

After testing, clean the solution tank and filter the saltwater to prevent clogging. The closed-loop water recovery system reclaims up to 80% of condensate, minimizing waste and reducing operating costs.

• Perform regular maintenance checks, such as verifying the calibration of sensors and ensuring the chamber's door and seals are intact.
• By following these steps, you can ensure that your coatings undergo rigorous testing that accurately reflects real-world conditions. With LIB SC Salt Spray Test Chamber, you gain access to a robust, automated system that meets global standards and offers reliable, reproducible results for your corrosion testing needs.

Any customization can be made. LIB offers a 3-year warranty and lifetime service. Any issues that cannot be resolved during the warranty period will be replaced free of charge. 24/7 English-speaking after-sales team. Fast shipping within 7-15 days.

Contact LIB Industry to develop a professional and efficient solution tailored to your specific standards and stringent requirements.